Angular Contact Ball Bearings（718 / 719 SERIES）
High-speed precision with controlled axial rigidityCHG 718/719 precision angular contact ball bearings are single-row, thin-section metric bearings designed for high-speed, high-accuracy rotating systems. A single bearing carries combined radial and axial load, with axial load acting in one direction; matched sets are used when axial load, rigidity or positioning is required in both directions.
Deep Groove Ball Bearings
Technical Specifications
| Series | Dimensional character | Recommended focus |
|---|---|---|
| 718 | Small cross-section and lower mass | High-speed spindles and restricted radial space |
| 719 | Larger section at the same bore | Higher load capacity and rigidity |
Key Product Benefits
- P4 rotational accuracy for precision spindle systems
- Selectable 15°, 25° and 40° contact angles
- DB, DF and DT matched-pair configurations
- Light, medium and heavy preload options
- Steel or hybrid ceramic rolling-element solutions
Technical Specifications
| Parameter | 718 Series | 719 Series |
|---|---|---|
| Bore diameter d | 10–850 mm | 10–710 mm |
| Outside diameter D | 19–1030 mm | 22–950 mm |
| Width B | 5–82 mm | 6–106 mm |
| Dynamic radial rating Cr | 1.80–620 kN | 2.90–767 kN |
| Static radial rating C₀r | 1.10–1674 kN | 1.77–1980 kN |
| Mass | 0.005–140 kg | 0.010–195 kg |
| Grease limiting speed | up to 75,000 r/min | 560–40,000 r/min |
| Oil limiting speed | up to 120,000 r/min | 750–56,000 r/min |
Standard Product Definition
| Item | Specification |
|---|---|
| Precision | P4 |
| Row configuration | Single row; matched sets available |
| Contact angle | C = 15°, AC = 25°, B = 40° |
| Ring material | Bearing steel or stainless steel |
| Ball material | Bearing steel, stainless steel or ceramic |
| Cage | Brass, PEEK, polyimide or phenolic-resin laminate |
| Operating temperature | Standard workbook range: −50 to +100 °C |
Contact Angle Selection
| Code | Contact angle | Selection guidance |
|---|---|---|
| C | 15° | Highest speed potential; lighter axial load |
| AC | 25° | Balanced speed and axial capacity |
| B | 40° | Higher axial capacity; lower limiting speed |
Matched Arrangements
| Code | Arrangement | Function |
|---|---|---|
| DB | Back-to-back | High moment rigidity; axial load in both directions |
| DF | Face-to-face | Better tolerance of alignment error; dual-direction axial load |
| DT | Tandem | Higher axial capacity in one direction |
Key Features
Preload
Standard matched bearings may be supplied with light (A), medium (B) or heavy (C) preload. Preload improves rotational accuracy, rigidity and running stability, but increases heat generation and reduces limiting speed. Final preload must be selected against speed, load, lubrication and temperature.
Selection, Applications & Ordering
High-Speed Design Notes
Use 19-series dimensions when radial space permits and higher shaft rigidity is required.
Oil lubrication and hybrid ceramic balls can support higher-speed spindle designs.
Derate catalog speed for pairing, preload, sealing, load and elevated temperature.
Keep matched bearings in their supplied order and mounting direction.
Typical Applications
High-speed machine-tool spindles, precision grinding spindles, machining centers, motorized spindles, semiconductor equipment, inspection systems, robotics and other high-accuracy rotating assemblies.
